HM1234FNL

Overview

The HM1234FNL is a surface mount pulse transformer designed for 100Base-TX applications. It features a 4-port configuration with Non-PoE support. Key electrical parameters include an inductance of 350uH and a resistance of 0.6 Ohms. The device supports a turns ratio of 1CT:1CT for both transmitter and receiver channels. It operates within a temperature range starting at -40°C and provides an isolation voltage of 1.5kV. The component utilizes a SMD package with dimensions of 28.19mm length, 15.44mm width, and 5.72mm height.

Feature Summary

• Engineered specifically for 100Base-TX Ethernet interfaces
• Supports Non-PoE configurations for data transmission
• Provides high isolation voltage for signal integrity

Applications

• 10/100 Base-T network interface cards
• Ethernet hubs and switches
• Industrial networking equipment

Procurement Notes

Verify the specific ordering suffix to ensure the correct package variant matches the design requirements. Confirm that the Non-PoE specification aligns with the power delivery needs of the target application. Check for AEC-Q200 qualification if automotive standards are required, as this may vary by sub-type. Ensure the surface mount footprint corresponds to the PCB layout specifications before finalizing the procurement order.

Selection Notes

Select this component when designing for 100Mbps Ethernet speeds requiring Non-PoE solutions. The 350uH inductance value is suitable for standard 100Base-TX signaling requirements. Consider the 1.5kV isolation rating for environments demanding robust electrical separation between network lines and ground. The compact SMD form factor aids in space-constrained board designs compared to through-hole alternatives.

Part Context

This part belongs to Pulse Electronics' LAN transformer portfolio, which includes various configurations for different Ethernet standards. The HM1234 series typically addresses legacy or specific industrial 10/100 Mbps connectivity needs. It complements higher-speed Gigabit and 10GBase-T offerings by providing cost-effective solutions for lower bandwidth applications where PoE is not utilized.

Replacement Considerations

HM1234NLT is a reel-packaged alternative within the same family. Verify pin compatibility and mechanical dimensions before substitution.